TLObject's __init__ used to call utils.get_input_* methods and
similar to auto-cast things like User into InputPeerUser as
required. Now there's a custom .resolve() method for this purpose
with several advantages:
- Old behaviour still works, autocasts work like usual.
- A request can be constructed and later modified, before the
autocast only occured on the constructor but now while invoking.
- This allows us to not only use the utils module but also the
client, so it's even possible to use usernames or phone numbers
for things that require an InputPeer. This actually assumes
the TelegramClient subclass is being used and not the bare version
which would fail when calling .get_input_peer().
This also replaces some int.to_bytes() calls with a faster
struct.pack (up to x4 faster). This approach is also around
x3 faster than creating a BinaryWriter just to serialize a
TLObject as bytes.
There was a race condition between TelegramBareClient.invoke
receiving part and MtProtoSender._handle_rpc_result actually
reading the result after setting request.confirmed = True.
The .confirmed is now a threading.Event to avoid the sleep(0.1).
RPC errors have been moved inside the request so they're not
raised on a background thread anymore.
